Protective liner for a cap



FIG. 1 is a first perspective view of a protective liner for a cap in accordance with my design;

FIG. 2 is a second perspective view thereof;

FIG. 3 is right side elevation view of the protective liner for a cap;

FIG. 4 is a bottom plan view of the protective liner for a cap;

FIG. 5 is a top plan view thereof;

FIG. 6 is a front elevation view thereof; and,

FIG. 7 is a rear elevation view thereof.

The broken lines in the drawings show the environment in which the design is used. The broken lines form no part of the claimed design. 

CLAIM The ornamental design for a protective liner for a cap, as shown and described. 